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Endoscopy · London

Private flexible sigmoidoscopy in London, performed by a consultant gastroenterologist.

A shorter, gentler bowel scope that examines the rectum, sigmoid and lower descending colon - often the right test for rectal bleeding, IBD monitoring and polyp screening. Prep is far lighter than a full colonoscopy.

A consultant gastroenterologist explaining a flexible sigmoidoscopy to a patient in a London clinic

Indicative pricing

What a private sigmoidoscopy costs in London.

Indicative ranges across UK private providers.

In short

£600-£1,100, with findings on the day.

Procedure Indicative range
Diagnostic flexible sigmoidoscopy £600–£1,100
Sigmoidoscopy with biopsies £700–£1,300
Sigmoidoscopy + polypectomy £900–£1,700
Rigid sigmoidoscopy (in-clinic) £250–£500
Unsedated flexible sigmoidoscopy £500–£900
Follow-up / surveillance sigmoidoscopy £600–£1,100

Prices vary by unit, whether sedation is used, and whether biopsies or polyps are taken and sent for analysis.

The problem

Not everyone with rectal bleeding needs a full colonoscopy.

Many people are pushed straight to a colonoscopy when a sigmoidoscopy - lighter prep, no sedation, back to work the same day - would answer the question. The aim is the right test, not the biggest one.

  • Fresh rectal bleeding?

    Most causes sit in the rectum or sigmoid. A flexi-sig usually finds them without the full prep.

  • Following UC or proctitis?

    A shorter scope is often all your gastroenterologist needs to grade activity and adjust treatment.

  • Considering a colonoscopy?

    Sometimes it is the right call. Your consultant should say when a sigmoidoscopy will not do the job.

What it shows

The indications that lead to a sigmoidoscopy.

A sigmoidoscopy answers most questions about the rectum, sigmoid and lower descending colon - and can treat as it goes.

  • Rectal bleeding investigation

    The clearest first look at fresh red bleeding - reaching the sigmoid, where most sources sit.

  • Polyp detection & removal

    Distal polyps can be found and removed during the same visit, before they become a problem.

  • IBD assessment (UC)

    Ulcerative colitis begins in the rectum. A sigmoidoscopy is often enough to grade activity and take biopsies.

  • Haemorrhoids & anorectal disease

    Confirms haemorrhoids, fissures and proctitis when symptoms are unclear.

  • Microscopic colitis biopsies

    Random mucosal biopsies to investigate chronic watery diarrhoea with normal-looking bowel.

  • Rectal cancer investigation

    A direct view of the rectum and sigmoid where a majority of bowel cancers arise.

  • Targeted screening

    A reasonable screening option for people who want a lighter test than a full colonoscopy.

  • Red flags - heavier concerns

    Heavy bleeding, weight loss or anaemia usually mean a full colonoscopy instead.

Procedure types

Not all sigmoidoscopies are the same.

What each variation on your referral is actually for.

  • Diagnostic flexible sigmoidoscopy

    A slim flexible camera examines the rectum, sigmoid and lower descending colon.

  • With biopsy

    Small tissue samples are taken from the lining to investigate inflammation or diarrhoea.

  • With polypectomy

    Distal polyps are removed and sent for analysis during the same procedure.

  • Rigid sigmoidoscopy (in-clinic)

    A short, rigid scope used in the outpatient clinic - mainly for the rectum, no sedation needed.

  • Unsedated flexible sig

    A quicker, drive-yourself option - mildly uncomfortable but back to work the same day.

  • IBD assessment sig

    Targeted at ulcerative colitis and proctitis, with graded biopsies of the rectum and sigmoid.

  • Post-treatment surveillance

    Planned follow-up after polyp removal, radiotherapy or IBD flare.

  • Combined with capsule or colonoscopy

    Sometimes paired with a capsule study or upgraded to a full colonoscopy if findings warrant.

Safety and eligibility

Very safe - with a much lighter run-up.

A sigmoidoscopy is one of the safer scopes there is. There are still practical things to plan - sedation, blood-thinners and the enema routine on the morning.

  • Simpler prep than colonoscopy

    Usually one or two enemas on the morning of the test - no full bowel prep, no clear-fluids day.

  • Sedation is optional

    Many patients have it without sedation.

  • Unsedated is faster

    Unsedated flexi-sig is quicker and lets you drive home, but is slightly uncomfortable for a few minutes.

  • No fasting from midnight

    A light diet the day before and enemas on the morning are usually all that is required.

  • Blood thinners may need pausing

    Warfarin, DOACs or clopidogrel may need adjusting if polyps are likely to be removed.

  • Iron and PPIs affect visibility

    Iron tablets can stain the mucosa.

  • Rare risks

    Bleeding and perforation are very uncommon in a diagnostic flexi-sig - well under 1 in 1,000.

  • Pregnancy

    Sigmoidoscopy is usually deferred in pregnancy unless essential.

  • Driving and work

    If you have sedation, no driving or work for 24 hours. Unsedated patients are usually back to normal within an hour.

Reading your report

A sigmoidoscopy report is short. And structured.

However far the scope reached, the report keeps to the same four parts.

A London consultant gastroenterologist reviewing endoscopy images

A quiet reminder

You will be told the headline on the day - the biopsy detail takes a few days more.

If you would like it talked through before your follow-up, ask your consultant or GP.

  1. 01 Header

    Your details and the indication

    Your details, what was examined, and the symptoms behind the referral.

  2. 02 Technique

    How the procedure was done

    Rigid or flexible, how far the camera reached, whether sedation was used, and where biopsies were taken.

  3. 03 Findings

    Rectum, sigmoid and distal colon

    Each segment described in turn - the rectum first, then the sigmoid, then the distal descending colon.

  4. 04 Impression

    The conclusion: read this first

    The headline and any biopsy pathway. Read this before the technical detail; histology results follow separately.

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Frequently asked

Common questions about sigmoidoscopy.

Quick answers on cost, prep, sedation, results and when it isn’t the right test.

  • What does a sigmoidoscopy show that a colonoscopy doesn’t?

    Neither test shows something the other misses in the lower bowel - the difference is reach. A sigmoidoscopy examines the rectum, sigmoid and lower descending colon; a colonoscopy examines the whole large bowel. For fresh rectal bleeding or IBD follow-up, a sigmoidoscopy is often the right first step.

  • How much does a private sigmoidoscopy cost in London?

    Adding biopsies or polyp removal costs more. Rigid in-clinic sigmoidoscopy is cheaper.

  • Sedation or unsedated - which should I choose?

    Most people find an unsedated flexi-sig manageable and prefer being able to drive themselves home. If you are anxious or expect polyp removal, light conscious sedation is straightforward to arrange.

  • How is the prep different from a full colonoscopy?

    Much lighter. There is no full bowel-prep drink and no clear-fluids day. Usually you eat lightly the day before and use one or two enemas on the morning of the test.

  • How long is the appointment?

    The scope itself takes 10–25 minutes. Expect to be at the unit for around 90 minutes including check-in, consent and short recovery. Unsedated appointments are quicker.

  • When will I get the biopsy results?

    Typically 3–7 days. Your consultant will explain what they saw on the day, and the histology report should be explained to you.

  • Will my insurance cover it?

    Most major UK policies cover a sigmoidoscopy when clinically indicated.

  • Is a sigmoidoscopy safe in pregnancy?

    It is usually deferred unless the indication is urgent. If a test is essential during pregnancy, it is discussed carefully with your obstetric team beforehand.

  • When should I call 999 instead?

    Heavy fresh rectal bleeding with dizziness or fainting, severe abdominal pain, or passing large amounts of blood - do not wait for an appointment. Call 999 or attend A&E.

Related content

Looking for something else?

In practice, in London

Booking sigmoidoscopy privately in London - what actually happens

With sigmoidoscopy, the London question is usually about report turnaround and the radiologist reading it - not whether the scan is available. On the NHS, sigmoidoscopy typically sits behind a triage step and a wait that can stretch from a few weeks into months. In London’s private sector, the same appointment often lands within days. That speed matters when symptoms are disrupting work, sleep, or a plan you’d already committed to - and it’s a common reason people consider private care.

A private sigmoidoscopy pathway in London usually looks like this: an initial consultation, any diagnostics booked at a nearby facility (most within Zone 1 or 2), and a written report sent to you and your GP within a few days. For sigmoidoscopy specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.

It helps to keep expectations realistic. A private sigmoidoscopy appointment in London won’t change the underlying medicine - the guidelines, the consultants, and the equipment are largely the same as on the NHS. What it changes is speed, continuity, and the amount of time you get to actually talk through the findings. UK doctors must be GMC-registered, and independent healthcare facilities in England are regulated by the CQC.